Korniichuk T. Dynamics of steel fiber concrete structures

The object of research - free oscillations of concrete and fiber concrete beams, hollow and airfield slabs; The purpose of the work is to develop methods for calculating the frequencies and shapes of natural oscillations of concrete and fiber-reinforced concrete beams and slabs for various purposes and their models; Research methods: empirical - conducting experimental studies of reinforced concrete and fiber-reinforced concrete beams of rectangular cross-section, multi-hollow and airfield slabs with natural oscillations; analysis and statistical processing of the obtained results; analytical methods for determining natural frequencies; computer modeling and numerical analysis by finite element method. For the first time in laboratory conditions during experimental researches new data concerning natural frequencies and forms of fluctuations of fiber-reinforced concrete beams of rectangular section are received; in laboratory conditions during experimental researches new data concerning natural frequencies and forms of fluctuations of multihollow plates of overlapping from fiber concrete are received; in laboratory conditions during experimental researches new data concerning natural frequencies and forms of fluctuations of aerodrome are received fiberglass slabs for both load schemes in accordance with current regulations; it is proved that in all considered designs the frequency spectrum was higher if they are made of fiber concrete. improved: methods of testing concrete and fibroconcrete for impact strength using pendulum-type dill; methods of calculating concrete and fiber concrete slabs for various purposes on their own fluctuations; received further development: methods of computer modeling of concrete and fiber-reinforced concrete slabs for various purposes and their calculation for natural oscillations in several leading domestic and foreign software packages. The results obtained in the dissertation, in the form of analytical, experimental and numerical methods of modal analysis in dynamic systems of concrete and fiber concrete, introduced into the design practice of LLC "Ecobud" Odessa, as well as in the educational process at the Odessa State Academy of Civil Engineering and Architecture in the preparation of masters in "Construction and Civil Engineering".